root@NetStudio:/www# cat welcome.html 

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>火灾监控报警系统</title>
    <style体页面背景设置 */
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
            background-color: #f0f0f5;
            font-family: Arial, sans-serif;
        }

      .start-button {
            padding: 15px 30px;
            font-size: 18px;
            border: none;
            border-radius: 5px;
            background-color: #007BFF;
            color: white;
            cursor: pointer;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            transition: background-color 0.3s ease;
        }

      .start-button:hover {
            background-color: #0056b3;
        }

      .exit-link {
            position: absolute;
            top: 15px;
            left: 15px;
            font-size: 16px;
            cursor: pointer;
            color: #FF3B30;
            text-decoration: none;
            transition: color 0.3s ease;
        }

      .exit-link:hover {
            color: #c72b23;
        }
    </style>
</head>

<body>
    <button class="start-button" onclick="startSystem()">欢迎使用火灾监控报警系统</button>
    <a class="exit-link" href="http://192.168.10.1:80/index.html">退出</a>
    <script>
        function startSystem() {
            window.location.href ='main.html';
        }
    </script>
</body>

</html>
